Buggy code:
public class TestIndexReader extends LuceneTestCase { public void testCommitUserData ( ) throws Exception { } public void testIsCurrent ( ) throws Exception { } public void testGetFieldNames ( ) throws Exception { } public void testTermVectors ( ) throws Exception { } private void assertTermDocsCount ( String msg , IndexReader reader , Term term , int expected ) throws IOException { } public void testBasicDelete ( ) throws IOException { } public void testBinaryFields ( ) throws IOException { } public void testChangesAfterClose ( ) throws IOException { } public void testLockObtainFailed ( ) throws IOException { } public void testWritingNorms ( ) throws IOException { } public void testWritingNormsNoReader ( ) throws IOException { } public void testDeleteReaderWriterConflictUnoptimized ( ) throws IOException { } public void testDeleteReaderWriterConflictOptimized ( ) throws IOException { } private void deleteReaderWriterConflict ( boolean optimize ) throws IOException { } public void testFilesOpenClose ( ) throws IOException { } public void testLastModified ( ) throws Exception { } public void testVersion ( ) throws IOException { } public void testLock ( ) throws IOException { } public void testUndeleteAll ( ) throws IOException { } public void testUndeleteAllAfterClose ( ) throws IOException { } public void testUndeleteAllAfterCloseThenReopen ( ) throws IOException { } public void testDeleteReaderReaderConflictUnoptimized ( ) throws IOException { } public void testDeleteReaderReaderConflictOptimized ( ) throws IOException { } public void testDiskFull ( ) throws IOException { } public void testDocsOutOfOrderJIRA140 ( ) throws IOException { } public void testExceptionReleaseWriteLockJIRA768 ( ) throws IOException { } public void testOpenReaderAfterDelete ( ) throws IOException { <START_BUG> File dirFile = new File ( TEMP_DIR , "deletetest" ) ; <END_BUG> Directory dir = newFSDirectory ( dirFile ) ; try { IndexReader . open ( dir , false ) ; fail ( "expected<seq2seq4repair_space>FileNotFoundException" ) ; } catch ( FileNotFoundException e ) { } dirFile . delete ( ) ; try { IndexReader . open ( dir , false ) ; fail ( "expected<seq2seq4repair_space>FileNotFoundException" ) ; } catch ( FileNotFoundException e ) { } dir . close ( ) ; } public void testMultiReaderDeletes ( ) throws Exception { } private void deleteReaderReaderConflict ( boolean optimize ) throws IOException { } private void addDocumentWithFields ( IndexWriter writer ) throws IOException { } private void addDocumentWithDifferentFields ( IndexWriter writer ) throws IOException { } private void addDocumentWithTermVectorFields ( IndexWriter writer ) throws IOException { } private void addDoc ( IndexWriter writer , String value ) throws IOException { } public static void assertIndexEquals ( IndexReader index1 , IndexReader index2 ) throws IOException { } public void testGetIndexCommit ( ) throws IOException { } public void testReadOnly ( ) throws Throwable { } public void testIndexReader ( ) throws Exception { } public void testIndexReaderUnDeleteAll ( ) throws Exception { } private Document createDocument ( String id ) { } public void testNoDir ( ) throws Throwable { } public void testNoDupCommitFileNames ( ) throws Throwable { } public void testFieldCacheReuseAfterClone ( ) throws Exception { } public void testFieldCacheReuseAfterReopen ( ) throws Exception { } public void testReopenChangeReadonly ( ) throws Exception { } public void testUniqueTermCount ( ) throws Exception { } public void testNoTermsIndex ( ) throws Throwable { } public void testPrepareCommitIsCurrent ( ) throws Throwable { } public void testListCommits ( ) throws Exception { } public void testIndexExists ( ) throws Exception { } public void testTotalTermFreqCached ( ) throws Exception { } public void testReaderFinishedListener ( ) throws Exception { } }

Fix:
File dirFile = _TestUtil . getTempDir ( "deletetest" ) ;